Teach Computing

Revision notes, activities, lesson plans, teaching ideas, and other resources for GCSE, A-Level, and IB Computer Science teachers and students.

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UK Computing Laws

This video from Computer Science Tutor covers the main UK computing laws re...

Wireless Networking (Wi-Fi, Security, and Hardware)

This video about wireless networking includes everything that is needed for...

Network topology videos

These four excellent videos from Computer Science tutor cover the four ma...

Network protocols

These four videos explain the main networking protocols that students are l...

Embedded Systems video

This short video is a good over of embedded systems, covering the main poin...

Representing Text in Binary

This video clearly explains the two main ways of representing text in binar...

Types of Malware

This video explains the various types of malware including viruses and troj...

Protecting against Malware

Following on from the Types of Malware video, this video explains technique...

Video: Network Security #1

This video gives an overview of the threats to networked computer systems, ...

Resources discount offer

3.1 Advanced Theory Data representation

Click here for recommended Cambridge A-Level Computer Science textbooks.

3.1.1 User-defined data types

3.1.2 File organisation and access

3.1.3 Real numbers and normalised floating-point representation

Floating point numbers

Floating point numbers

A good explanation of why we use floating point numbers. Also covers their limitations as approximations, with good explanations of floating point rounding errors applied to real-life concepts such as currency and accounting.

Updated: 2015-06-03